‰  NOW 40 WPM  ‰  TEXT IS FROM DECEMBER 2005 QST  PAGES 66 AND 97  ‰

INFORMATION ABOUT FEATURES CURRENTLY UNDER DEVELOPMENT.  TO GET THE MOST
FROM THE PACKAGE, YOULL NEED A GOOD COMPUTER.  THE RECOMMENDED
CONFIGURATION INCLUDES A PENTIUM 4 AT 2R2 GHZ OR ATHLON XP 2000 PROCESSOR,
512 MB OF RAM, AN AGP 4X VIDEO CARD WITH
‰  FROM PAGE 97  ‰
Crawford ARS W3MIE 236 2 22 1,336 WPA Winnipeg ARC VE4BB 322 2 80 1,334 MB

THE FFT VIEWS INCLUDE SUCH COMMON SPECTRUM ANALYZER FUNCTIONS AS AVERAGING,
SMOOTHING, MAX HOLD, PEAK SEARCH AND A MEASUREMENT MARKER.  RESOLUTION
BANDWIDTH CAN BE VARIED DOWN TO ABOUT 0R03 HZ TO DIG OUT THOSE SIGNALS
BELOW THE NOISE LEVEL AT THAT SETTING EACH DATA CAPTURE TAKES ABOUT 30
SECONDS, AND NOISE IS AVERAGED DOWNWARD DURING THAT TIME WHILE CONSTANT
LEVEL SIGNALS REMAIN UNCHANGED.  THE RESOLUTION BANDWIDTH IS DEPENDENT ON
THE SELECTED FILTER BANDWIDTH AND THE FFT SIZE.  WIDER BANDWIDTHS AND
SMALLER FFTS RESULT IN MORE RAPID DISPLAY UPDATES, BUT LESS NOISE
AVERAGING.  UNLIKE AN ANALOG TYPE OF ANALYZER, THE FFT DERIVED FREQUENCY
DATA UPDATES IN REAL TIME, SO YOU CAN SEE THINGS LIKE THE DYNAMIC CHANGE OF
SIDEBANDS ON AN AM BROADCAST STATION WHILE LISTENING TO THE MUSIC OR
ANNOUNCER.  THE VERTICAL SCALE IS MARKED ON THE LEFT SIDE OF THE DISPLAY IN
DBM DECIBELS RELATIVE TO A MILLIWATT AND THE FREQUENCY SCALE MHZ IS ACROSS
THE TOP.  IN TESTING IN THE ARRL LAB AT SEVERAL LEVELS FROM 30 DBM TO 130
DBM OVER A RANGE OF FREQUENCIES FROM HF THROUGH VHF, IT WAS FOUND THAT
THESE LEVELS WERE QUITE ACCURATE WHEN THE CALIBRATED SCREEN OPTION WAS
‰  FROM PAGE 97  ‰
Panoramaland ARC K7JAR KE7DSK 444 1 28 1,458 EWA Lockport ARA W2RUI 330 2
26 1,452 WNY Everglades ARC W4SVI 284 2 15 1,440 SFL Santa Barbara West Co
ARES W9EC 220 2 9 1,420 SB Saratoga Co RACES Assn WA2UMX 423 2 18 1,418 ENY
‰  QST DE W1AW  ƒ

ENABLED IN THE SETUP MENU.  UNLIKE SOME SOUND CARD BASED SPECTRUM ANALYZER
SOFTWARE I HAVE TRIED ADMITTEDLY SHAREWARE, THE SPECTRAVUE PROGRAM ALLOWS
FULL CONTROL OVER THE SPAN AND VERTICAL SCALES OF THE DISPLAY.  THE LATTER
HAS OPTIONS OF 10 DB, 5 DB, 2 DB, 1 DB, 0R5 DB AND 0R2 DB PER VERTICAL
DIVISION.  ANOTHER NICE FEATURE IS THAT THE PEAK LEVEL TO THE NEAREST WHOLE
DB IN THE DISPLAY WINDOW IS SHOWN IN A BOX NEAR THE DEMOD OPTION SECTION OF
THE SCREEN.  THE MOUSE CURSOR CAN BE ROLLED OVER THE SPECTRUM DISPLAY AND
THE AMPLITUDE AND FREQUENCY VALUES APPEAR BELOW THE SPECTRUM ON THE RIGHT
SIDE OF THE SCREEN.  THE AMPLITUDE RESOLUTION OF THIS READOUT VARIES FROM
1/10TH TO 1/100TH OF A DB DEPENDING ON THE VERTICAL SCALE AND FREQUENCY
RESOLUTION VARIES FROM 1 HZ TO 1/1000TH OF A HZ DEPENDING ON THE CENTER
FREQUENCY HIGHER RESOLUTION FOR LOWER FREQUENCY MEASUREMENTS.  THE 3D FFT
SCREEN FIGURE 6 IS A RATHER INTERESTING FEATURE THAT ADDS A HISTORICAL
PERSPECTIVE TO THE SPECTRUM.  THAT IS TO SAY THAT IT DISPLAYS MULTIPLE TIME
‰  FROM PAGE 97  ‰
Dauberville DX Assn K3TI K3YTR 350 2 14 1,408 EPA CERTS/CARC VE3BPQ 432 2 5
1,400 ON VE3TNC 277 2 20 1,394 ON Martin Co ARES/RACES WX4MC 260 2 32 1,386
‰  END OF 40 WPM TEXT  ‰  QST DE W1AW  ƒ